<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Outer</title>
    <style>
      .app{
        height: 100%;
      }
      .outer{
        padding: 16px;
      }
    </style>
  </head>
  <body>
    <div class="app">
      <div class="outer">
        <h3>Is in app</h3> 
        <div>Main content</div>
      </div>
      <hr>
      <webview id="webview1" src="./inner1.html"></webview>
      <webview id="webview2" src="./inner2.html"></webview>
    </div>
    <script src="outer.js"></script>
  </body>
</html>
